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Unread 09-05-2010, 11:21
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548swimmer 548swimmer is offline
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AKA: Alec Wagner
FRC #0548 (Robostangs)
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Re: pic: Prototype Drivetrain v2

Quote:
Originally Posted by Edoc'sil View Post
Forget the suspension if you are not doing two things:

Driving over rough terrain like the bumps
Powering all wheels


You speak of a "smother ride" and I really do not understand what it will benifit you. If you are concerned about your electronics mount them on a foam surface, or some other kind of protection. If you don't want to jostle the rest of your bot, well, almost all of the jostling comes from collisions, not deceleration from turning and stopping.

Also if your bot cam into any kind of pushing match it would distinctly be in the featherweight class. Not only will the omnis make it so that you well be easily spun, the 4 useless wheels will give you significantly pushing power. On your v1 thread you mentioned that you mechanical guy said he could put 75% of the weight in the center. I do not see how that is possible when you don't know what next years challenge is.


Here is one way to keep the chains in tensioned

http://www.flickr.com/photos/47595136@N03/4592232432/
http://www.flickr.com/photos/47595136@N03/4591612471/
http://www.flickr.com/photos/47595136@N03/4591612485/

Power the middle wheel run chain to the other axles, and then add a suspension to the angled bars with closed pneumatics.
I do want to power the omni's I'm just not sure of the best way to go about this. I like your idea of running pneumatics as shock's, but many members of my team have something against them, so it will be a battle to get them incorporated. I was hoping it would be possible to use springs for the suspension because they add less complexity and weight.

As for the weight distribution, that 75% was assuming the CG was in fact in the geometric center of the robot, and it usually is pretty close to that.

This whole concept may never get built. This is just to inspire the younger designers that I'm training over the summer and to provide us with a jumping off point for next year's challenge. If there is a surface feature like a large washboard or uneven, low steps going up to some important game piece, the suspension will be useful.
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